排序方式: 共有73条查询结果,搜索用时 12 毫秒
31.
Khorasani-Motlagh M Noroozifar M Mirkazehi-Rigi S 《Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy》2011,79(5):978-984
The binding of neodymium(III) and praseodymium(III) complexes containing 1,10-phenanthroline, [M(phen)2Cl3·OH2] (M=Nd (1), Pr (2)), to DNA has been investigated by absorption, emission, and viscosity measurements. The complexes show absorption decreasing in charge transfer band, fluorescence decrement when bound to DNA. The binding constant Kb has been determined by absorption measurement for both complexes and found to be (6.76±0.12)×10(4) for 1 and (1.83±0.15)×10(4)M(-1), for 2. The fluorescence of [M(phen)2Cl3·OH2] (M=Nd (1), Pr (2)) has been studied in detail. The results of fluorescence titration reveal that DNA has the strong ability to quenching the intrinsic fluorescence of Nd(III) and Pr(III) complexes through the static quenching procedure. The binding site number n, apparent binding constant Kb and the Stern-Volmer constant kSV are determined. Thermodynamic parameters, enthalpy change (ΔH°) and entropy change (ΔS°), are calculated according to relevant fluorescent data and Van't Hoff equation. The experimental data suggest that the complexes bind to DNA by non-intercalative mode. Major groove binding is the preferred mode of interaction for [M(phen)2Cl3·OH2] (M=Nd (1), Pr (2)) with DNA. 相似文献
32.
Mozhgan Masoudi Mohammad Reza Shahbazi‐Manshadi Mohammad Anary‐Abbasinejad 《Journal of heterocyclic chemistry》2019,56(10):2772-2778
Heterocyclic systems containing bis (imidazolyl) pyrrole or imidazolyl indole moieties were synthesized by heterocyclization of pyrrole or indole with arylglyoxal monohydrates and N‐aryl amidines in ethanol catalyzed by FeCl3 at room temperature. The paper reports a facile, efficient, and environmentally friendly protocol for the synthesis of new products. Products were isolated by simple filtration, and their structures were established from their spectroscopic data. 相似文献
33.
Esfandiari Mozhgan Abbas Ali Kareem Vakili Mohammad Reza Shahbazi-Alavi Hossein Safaei-Ghomi Javad 《Research on Chemical Intermediates》2021,47(2):483-496
Research on Chemical Intermediates - Chitosan functionalized by triacid imide has been applied as an effective catalyst for the synthesis of benzodiazepines by one-pot reactions of... 相似文献
34.
Shohre Rouhani Kamaladin Gharanjig Mozhgan Hossein Nezhad 《Green Chemistry Letters and Reviews》2014,7(2):174-178
This study describes the ultrasound-assisted synthesis of 4-nitro-N-substituted-1,8-naphthalimide derivatives from 4-nitro-1,8-naphthalic anhydride and related amines by irradiating at 35 KHz in a sonic bath in aqueous media at room temperature. The results obtained by this method are comparable to those obtained by a common reflux method. The imidation reaction under ultrasound irradiation preceded 8 and 20 times faster than the common method and produced higher yields. 相似文献
35.
Szatylowicz Halina Jezuita Anna Siodla Tomasz Varaksin Konstantin S. Ejsmont Krzysztof Shahamirian Mozhgan Krygowski Tadeusz M. 《Structural chemistry》2018,29(4):1201-1212
Structural Chemistry - Substituents effects in cyclic diene derivatives are studied using quantum chemical modeling and compared to the corresponding effects in aromatic (benzene) and fully... 相似文献
36.
Farzaneh Shemirani Seyedeh Mozhgan Behgozin 《Journal of the Iranian Chemical Society》2018,15(9):1907-1912
37.
A flow injection analysis (FIA)-background correction method comprising two solid-phase reactors and spectrophotometry for determination of ascorbic acid (AsA) is proposed. A polyethylene mini-column filled with solid iodine (30% m/m suspended on silica gel beads), reactor 1, and other column filled only with silica gel, reactor 2, which are then incorporated in a flow system so that solid iodine reagent in reactor 1 is affected as the sample passes through the column. The sample blank is produced by the oxidation of the AsA by iodine to form dehydroascorbic acid, insensitive to ultraviolet at 267 nm. AsA in samples is determined after injected in reactor 2; the difference in two analytical signal observed is related to amount of AsA. The linear range of the system is up to 50 μg ml−1 with a detection limit of 0.08 μg ml−1, R.S.D. of better than 1.0% and sampling frequency of 110 sample h−1. The method is successfully applied to the determination of AsA in pharmaceuticals and foods. 相似文献
38.
Zahra Aramesh-Boroujeni Abdol-Khalegh Bordbar Mozhgan Khorasani-Motlagh Najme Fani Elham Sattarinezhad Meissam Noroozifar 《Journal of the Iranian Chemical Society》2018,15(7):1581-1591
In this paper, several rare earth [terbium(III), ytterbium(III) and yttrium(III)] complexes containing 2,9-dimethyl-1,10-phenanthroline (Me2Phen) were successfully synthesized and characterized by means of elemental analysis (CHN), infrared spectroscopy (FT-IR), UV–vis absorption spectroscopy and 1HNMR. To explore the potential medicinal value of these complexes (MMe2Phen), their binding interactions with human serum albumin (HSA) were investigated through UV–vis and fluorescence spectroscopies and also molecular docking examinations. The thermodynamic parameters, binding forces and Förster resonance distance between these complexes and Trp-214 of HSA were estimated from the analysis of fluorescence measurements. The values of estimated binding constants (Kb) ranging for the formation of MMe2Phen:HSA complex were in the order of 105 M?1. The thermodynamic parameters determined by van’t Hoff analysis of Kb (ΔH°?<?0 and ΔS°?<?0) clearly indicate the major rules of hydrogen bonds and van der Waals interactions in the formation process of MMe2Phen:HSA. The values of Stern–Volmer constant and the evaluation of dynamic quenching constant at various temperatures provided good evidences for static quenching mechanism. Furthermore, the results of molecular docking calculation and competitive binding experiments represent the binding of these complexes to site 3 of HSA located in subdomain IB, containing both polar and apolar residues. The consistency of computational and experimental results, according to the binding sites and the order of binding affinities (TbMe2Phen?>?YbMe2Phen?>?YMe2Phen), supports the accuracy of docking calculation. 相似文献
39.
Mozhgan Samandar Sangari Mehdi Rashidi S. Masoud Nabavizadeh Banafshe Askari Fatemeh Niroomand Hosseini 《应用有机金属化学》2018,32(1)
Oxidative addition of 2‐phenylethylbromide (PhCH2CH2Br) to dimethylplatinum(II) complexes [PtMe2(NN)] ( 1a , NN = 2,2′‐bipyridine (bpy); 1b , NN = 1,10‐phenanthroline (phen)) afforded the new organoplatinum(IV) complexes [PtMe2(Br)(PhCH2CH2)(bpy)], as a mixture of trans ( 2a ) and cis ( 3a ) isomers, and [PtMe2(Br)(PhCH2CH2)(phen)], as a mixture of trans ( 2b ) and cis ( 3b ) isomers, respectively. The new Pt(IV) complexes were readily characterized using multinuclear (1H and 13C) NMR spectroscopy and elemental microanalysis. The crystal structure of 2a was further determined using X‐ray crystallography indicating an octahedral geometry around the platinum centre. A comparison of reactivity of RCH2Br reagents (R = CH3, Ph or PhCH2) in their oxidative addition reactions with complex 1a , with an emphasis on the effects of the R groups of alkyl halides, was also conducted using density functional theory. 相似文献
40.